锁

参考文章：
[1]http://blog.csdn.net/v_victor/article/details/52232685
[2]http://www.cnblogs.com/luyucheng/p/6297752.html
[3]http://www.cnblogs.com/chenqionghe/p/4845693.html
[4]http://tech.meituan.com/innodb-lock.html 美团技术团队
[5]http://yeshaoting.cn/article/database/mysql%20insert%E9%94%81%E6%9C%BA%E5%88%B6/

丢失更新问题
[6]http://www.cnblogs.com/DreamDrive/p/4090919.html
[7]http://blog.csdn.net/mageshuai/article/details/4544188
[8]http://tojaoomy.iteye.com/blog/1979466
[9]http://database.51cto.com/art/201108/286702.htm